net.inet.tcp.rfc1323
Setting it to 1, the default, turns it on, setting it to 0, turns it off.
Looking at my OpenBSD machine, I see the same sysctl MIB as FreeBSD.
Finally, checking my laptop with Linux kernel 2.4.20, I find net.ipv4.tcp_timestamps, which likely has the same effect.
So, if you're worried about the technique being used on you, set those sysctl MIBs to 0, and don't worry about it. ;)
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